feat(ai-sdk): ePrivacy/cookie topic — §25 TDDDG co-primary for cookie questions

The TDDDG (ex-TTDSG) pilot revealed §25 TDDDG (terminal-equipment / cookie consent)
ranked #3 on a cookie query — the subsidiarity rule demoted it as DE law subsidiary
to the DSGVO, but TDDDG is lex specialis (ePrivacy) for cookies.

Topic-based fix (NOT blanket TDDDG > DSGVO):
- cookie/ePrivacy topic (cookie/endeinrichtung/endgeraet/tracking -> §25 TDDDG) so it is
  co-primary (topic-matched -> topicGain, no subsidiarity demote).
- TDDDG/TTDSG added to the data_protection domain (chunkDomain recognition).
- cookie-specific keywords (NOT bare 'Einwilligung') so a general consent question still
  resolves to Art. 7 DSGVO.

Acceptance on the DSGVO+BDSG+TDDDG build: cookie -> §25 TDDDG top-1; Rechtsgrundlage -> DSGVO;
DSB -> Art.37+§38 BDSG (not TDDDG); degraded=0, must_not=0. go build/vet/test green; 2 new table tests.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ai-compliance-sdk/internal/ucca/authority.go

@@ -110,9 +110,10 @@ type domainDef struct {
 // Deterministic order (slice, not map) — important for stable classification + tests.
 var domains = []domainDef{
 	{"data_protection",
-		[]string{"DSGVO", "GDPR", "BDSG", "EDPB", "DSK", "BfDI", "BayLfD", "DPF"},
+		[]string{"DSGVO", "GDPR", "BDSG", "TDDDG", "TTDSG", "EDPB", "DSK", "BfDI", "BayLfD", "DPF"},
 		[]string{"personenbezogen", "betroffene", "datenschutz", "datenschutzbeauftrag", "dsb",
-			"datenpanne", "auskunft", "loesch", "lösch", "einwilligung", "besondere kategorien", "auftragsverarbeit"}},
+			"datenpanne", "auskunft", "loesch", "lösch", "einwilligung", "besondere kategorien", "auftragsverarbeit",
+			"cookie", "endeinrichtung", "endgerät", "endgeraet", "tracking"}},
 	{"cyber",
 		[]string{"CRA", "NIS2", "NIS-2", "ENISA", "DORA", "EUCC"},
 		[]string{"security update", "sicherheitsupdate", "sicherheitsaktualisierung", "schwachstelle", "sbom",
@@ -200,6 +201,11 @@ var topics = []topicDef{
 	{[]string{"bussgeld", "geldbusse"}, []string{"Art. 83"}},
 	{[]string{"security update", "sicherheitsupdate", "schwachstelle", "sbom", "cybersicherheitsanforderung"}, []string{"CRA Anhang I"}},
 	{[]string{"meldepflicht", "sicherheitsvorfall"}, []string{"Art. 14 CRA"}},
+	// ePrivacy / cookies: § 25 TDDDG (ex-TTDSG) is lex specialis for terminal-equipment access /
+	// cookie consent. Co-primary on a cookie/tracking query, so the subsidiarity rule does NOT
+	// demote it like general-DP DE law subsidiary to the DSGVO. Keywords are cookie-specific
+	// (NOT bare "Einwilligung") so a general consent question still resolves to Art. 7 DSGVO.
+	{[]string{"cookie", "endeinrichtung", "endgerät", "endgeraet", "tracking", "speicherung von informationen", "zugriff auf informationen"}, []string{"§ 25 TDDDG"}},
 }
 
 // resultMatchesTopic reports whether the result is a preferred norm of a topic the query hits.

ai-compliance-sdk/internal/ucca/authority_rerank_test.go

@@ -123,6 +123,28 @@ func TestRerankByAuthority_Acceptance(t *testing.T) {
 		}
 	})
 
+	t.Run("ePrivacy: a cookie query lifts §25 TDDDG above DSGVO consent (lex specialis topic)", func(t *testing.T) {
+		in := []LegalSearchResult{
+			bindingRes("Art. 7 DSGVO", "DSGVO", "EU", 0.70), // higher semantic
+			bindingRes("§ 25 TDDDG", "TDDDG", "DE", 0.66),
+		}
+		out := rerankByAuthority("Wann ist eine Einwilligung fuer das Speichern von Cookies auf Endgeraeten erforderlich?", in)
+		if out[0].RegulationShort != "TDDDG" {
+			t.Fatalf("§25 TDDDG must win a cookie question (lex specialis topic), got %q", out[0].ArticleLabel)
+		}
+	})
+
+	t.Run("a general consent question still resolves to DSGVO, not §25 TDDDG", func(t *testing.T) {
+		in := []LegalSearchResult{
+			bindingRes("§ 25 TDDDG", "TDDDG", "DE", 0.70), // higher semantic but no cookie topic
+			bindingRes("Art. 7 DSGVO", "DSGVO", "EU", 0.66),
+		}
+		out := rerankByAuthority("Welche Anforderungen gelten an eine wirksame Einwilligung?", in)
+		if out[0].RegulationShort != "DSGVO" {
+			t.Fatalf("a general consent question must resolve to DSGVO (TDDDG demoted), got %q", out[0].ArticleLabel)
+		}
+	})
+
 	t.Run("co-primary dp_01: BDSG §38 stays top on a DSB question (national special rule)", func(t *testing.T) {
 		in := []LegalSearchResult{
 			bindingRes("§ 38 BDSG", "BDSG", "DE", 0.66),